CM850 Electronic Control System – FAULT CODE 2347 (ISB/QSB Automotive or Industrial Application)

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Overview

Turbocharger Compressor Inlet Air Temperature Sensor Circuit SMALL | MEDIUM | LARGE

Circuit Description

The turbocharger compressor outlet temperature is calculated by the electronic control module (ECM) and based on engine operating conditions such as turbocharger compressor inlet temperature, barometric pressure, turbocharger speed, engine speed, intake manifold air temperature, and intake manifold pressure.

Component Location

There is not a physical turbocharger compressor outlet temperature sensor on the engine. The turbocharger compressor outlet temperature is a calculation of the temperature of the air after it is compressed by the turbocharger but before Exhaust Gas Recircluation (EGR) is mixed into the system and before it enters the charge air cooler.

Shop Talk

Possible causes for high turbocharger compressor outlet temperature include:

• Air intake leaks between the air filter and turbocharger, allowing warm underhood air to enter the turbocharger compressor inlet
• Incorrect turbocharger compressor inlet temperature sensor output
• Incorrect output of sensors used to calculate turbocharger compressor outlet temperature, such as ambient air pressure and turbocharger speed.

NOTE: This code will most likely not be active with no load in the shop. The engine must be loaded to trip this fault code and determine if the failure has been found and fixed.

Refer to Troubleshooting Fault Code t05-2347